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I determined that there was no +5V supplied by the main ECU. There was no short in the harness. The accelerator dial should have +5V on pin 4 and ground on pin 3. Pins 1 and 2 are the sensor outputs to the ECU. Check the resistance to ground on all pins. Only the ground pin should show low...

I am having the exact same problem with a 2017 SSV65. Error code 021. Did you ever find the the problem and fix it?